...
'top-algorithms-and-data-structures-for-competitive-programming':http://www.geeksforgeeks.org/top-algorithms-and-data-structures-for-competitive-programming/
'www.khanacademy.org/computing/computer-science/algorithms':https://www.khanacademy.org/computing/computer-science/algorithms/
'www.learnalgorithms.in':http://www.learnalgorithms.in/

'www.codeforces.com':http://www.codeforces.com/
'projecteuler.net':https://projecteuler.net/
'www.pbinfo.ro':http://www.pbinfo.ro/
'visualgo.net':http://visualgo.net/
'https://leetcode.com/':https://leetcode.com/
'https://www.hackerrank.com':https://www.hackerrank.com
'http://campion.edu.ro/arhiva/':http://campion.edu.ro/arhiva/